Add Norwegian Bokmål passive verb template

The template was provided by [[User:Jon Harald Søby]] [1] at
[[Wikidata:Wikidata Lexeme Forms/Norwegian Bokmål]] [2] – thank you!

Also, update the regular verb template so the imperative form no longer
has a capitalized form at the beginning of the example.

[1]: https://www.wikidata.org/wiki/User:Jon_Harald_Søby
[2]: https://www.wikidata.org/wiki/Wikidata:Wikidata_Lexeme_Forms/Norwegian_Bokmål